How to get php session data from a google sign in

Question

I am trying to create a website where users login with their google login (https://developers.google.com/identity/sign-in/web/sign-in). The site has multiple pages and gets data for the user from a mysql database. I would like to store the users' data (name, email) in a php session to have ready for the php when accessing the database. The login function works, but I can't figure out how to get the data to php, with it currently all in javascript.

Answer 1

There wasn't a conventional way to do this, but I was able to get the information from the google auth token

function get_var($var_index) {
    $id = $_POST["id"];
    $id_token = file("https://www.googleapis.com/oauth2/v3/tokeninfo?id_token=" . $id);
    $var = str_replace("\"", "", $id_token[$var_index]);
    $var = str_replace(",", "", $var);
    $var = substr($var, strpos($var, ":") + 2 );
    return $var;
}


$name = get_var(12);
$email = get_var(5);
$img_url = get_var(13);
$exp = get_var(8);
$iss = get_var(9);



if ($_SERVER['REQUEST_TIME'] < $exp) {
    session_start();
    $_SESSION["name"] = $name;
    //$_SESSION["imageurl"] = $img_url;
    $_SESSION["email"] = $email;
    $_SESSION["exp"] = $exp; // when to auto logout

     header("LOCATION: page.php");
     exit();
} else{
    header("LOCATION: loginpage.html");
}